Questions tagged [hobbyist]

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1answer
32 views

Flywheel/Dynamo behavior under variable load

I have a special effects project in mind where I simulate a bellows and coal fire without, you know, actual fire. My vision thusfar involves rigging a flywheel to a short-stroke lever (the upper arm ...
0
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3answers
89 views

How to delay astable 555 timer IC by ~1 min

My problem: I've reproduced the 555 timer circuit from here: https://www.gadgetronicx.com/door-open-alarm-ic-555/. Because of the specifics of my application I'd like the signal at the speaker to be ...
16
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4answers
4k views

How do you store ICs used in hobby electronics?

I've recently started working on a project and I need to find a way to store some ICs that I'm using. I have around five different ICs and someone said I could just put them all together in a small ...
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2answers
40 views

How can I use a 5200 mAh Li-Po battery to power multiple things?

I'm building an autonomous car and have a 7.4V 5200mAh 2S Li-Po battery that needs to power the following components: Brushless DC Motor (Through ESC) Raspberry Pi 4 Servo motor Arduino Uno Another ...
0
votes
1answer
74 views

Is this gate driver circuit sufficient to drive a parallel FET spot welder?

I am building a spot welder for attaching nickel strips to Li-Ion cells to make custom battery packs. There are plenty on the market but I wanted to use up some components and learn something. The ...
0
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1answer
77 views

Can a short circuit kill the USB port of a PC?

I use a cut USB cable as a 5V power supply from my laptop. If the two wires on the other side happen to touch each other, will it kill my USB port? Just to be cautious.
0
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2answers
101 views

Live plant as a touch switch

I’m a Jack of all trades sort of guy but have basically zero electrical knowledge.. That being said.. I want to use a live.. real plant...to turn on and off a light. I tried a touch switch replacement ...
0
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1answer
167 views

Charging 18650 battery with built-in PCb

How would I charge an 18650 battery with a built-in protection circuit? This is for an infrared camera. I normally could charging the device via micro usb but port broke. 4 wires are soldered to the ...
7
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6answers
2k views

When did DC-DC buck converter modules become so popular?

Is it just me or from maybe since 4 years ago every project online for hobbyist electronics is using switch-mode power circuits in them? Looking back 15 years ago at projects from when I started doing ...
3
votes
1answer
929 views

Which IC component is this?

I seem to have burned out this chip on my Hobby King ESC (see picture). I am not able to read the component part number. The ESC is no longer available to buy. What is the part number (so that I may ...
3
votes
4answers
281 views

What's the difference between chip families

I've been trying to follow Ben Eater's 8 bit computer design (https://eater.net/8bit) and I've manged to build something that broadly works but it's not very reliable. Sometimes modules don't work, if ...
0
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0answers
48 views

Micro-USB B - female weird pinout

fixing up a kids toy today that used a USB Micro-B cable/port. The female port was smashed up. I have started to remove the old female socket and noticed it did not use a standard pin out. Rather than ...
0
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1answer
57 views

Specifications of a motor which will light an led (momentarily) from hand-spinning?

EDIT: I feel I might have placed the emphasis wrongly in my original question so I'll try to revise it here. In the video cited the demonstrator can be seen spinning a small "hobby" motor ...
0
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3answers
111 views

Why are the parts more expensive than a Pro Micro? [closed]

I have just started studying electronics and I am having a good time. In the past my experience would have been to use cheap boards, such as the Pro Micro. What I find confusing is that parts, such as ...
0
votes
1answer
61 views

How does a layman interface with a system on a chip?

I'm looking to build an incredibly simple robot that I control via bluetooth. I've identified the CC2540 from TI which will theoretically allow me to do this. It sounds perfect, it's like 5 bucks. ...
0
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0answers
38 views

RF Communication Fresnel Zone Issues

I'm working on an two systems, each with the following connections: 433 Mhz 900 Mhz 5.8 Ghz All links are omni-directional and vertically polarized. Only 1 set of (3) links are active at a given ...
2
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2answers
1k views

How to mount a PCB in a project box

Hi nearly finished my first electronics project and I need to think about how to mount it into a box. I feel like I am missing something absolutely obvious with how to use PCB spacers. Here is a ...
0
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1answer
30 views

Honeywell TH1100DH1004 - temperature signal

Is it possible to have this (non programmable ) thermostat communicate only a constant temperature reading regardless of what the sensor senses? My understanding is that it communicates a value set ...
1
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4answers
385 views

Safety: Can I harm myself using an AC, 9V 500mA power supply for experiments?

I'm about to embark on my first electronics project and would like to check off a safety question: I want to build a bicycle hub dynamo -> USB charger based on these instructions. It is basically a ...
0
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2answers
140 views

Why is this circuit causing my breaker to trip?

I'm an electronics hobbyist and I decided to make my own electric heater/kiln thingy. It works fine for a couple of minutes, but then the breaker trips. This is my first project involving AC, so I'm a ...
0
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4answers
360 views

Adjustable Power Supply with LM317

I want to create an adjustable power supply for my electronics projects, and the cheapest/fastest option seems to be using an LM317. However, I do not want to blow things up by doing something wrong (...
1
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4answers
99 views

What to look for when buying a reliable hobbyist soldering iron

I wanted to buy a soldering iron for some hobby tinkering, ordered one long ago from Wish! For a few quid, but as you must imagine it's awful. Doesn't heat uniformly, overheats and melts plastic. Tips ...
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2answers
289 views

Phone on a breadbord

My current electronics project is to build a very simple customizable "phone". It is my own idea, with as ultimate goal to learn about microcontrollers and basic electronics. This is my set-up so far ...
2
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0answers
123 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
2
votes
2answers
1k views

Bandpass Filter: Single supply op amp design

I have taken on a hobby project and I am trying to make a circuit which would be able to identify an acoustic signal with a frequency of 40kHz. Here is the circuit of a band pass filter for this: ...
0
votes
1answer
207 views

Should I spread the pads out on the footprint of a THT LED?

I have a 4 pin RGB LED with a common anode. I'm trying to make my first PCB and I am creating the footprint for the LED now. I don't have a datasheet for the LEDs unfortunately. I have a ruler ...
0
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2answers
695 views

Do I need decoupling capacitors when I'm PWMing an LED?

I'm a hobbyist (well, less than a hobbyist really) trying to layout my first PCB design. I'm somewhat familiar with the concept of decoupling capacitors. I'm fading 3 LEDs in and out (really, it's ...
0
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1answer
54 views

using 7.62mm screw terminals on prototype board

What have people done to be able to use 7.62mm screw terminals on prototype boards? I am trying to prototype something use screw terminals that have 7.62mm posts, but the prototype boards do not have ...
3
votes
3answers
633 views

Simple, low precision, milliohmmeter

Would like to have a simple milliohmeter for car wiring checking. Precision is not important, it's not about 3 vs 4 mΩ, it's about 3 vs 30 vs 300 mΩ. Simple idea is a 1A floating current source (2 ...
0
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2answers
2k views

Replicate PCB design on stripboard

I'm thinking about making a DIY project (this one). I'm a complete n00b, I just have some theoretical knowledge about electronics from some university courses, and I'd like to learn some more. I was ...
1
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3answers
264 views

Could one actually build electronics without EE degree? [closed]

I understand that a teach yourself electronics book can "teach you electronics", but just how far can that take you developmentally? I want to have the ability to solve a problem requiring the ...
7
votes
7answers
3k views

Is it cheating if I use an SRAM chip as a register file? [closed]

I'm currently building my very own processor using discrete logic (74LSxx series and that) using my very own instruction set architecture. I am starting to rack up a bit of a bill because all the ...
1
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4answers
7k views

Power connectors: 2.1mm and 2.5mm, 1.35 and 1.7mm

I refer to DC power connectors used for a wide variety of common consumer devices. I notice that I have to specify between 2.1mm and 2.5mm when I want to purchase these online. Are the two ...
-2
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1answer
67 views

Cupboard lighting problem

I have some battery powered LED lights to go in a cupboard; and I have a 5-terminal magnetic alarm sensor to turn them on when the cupboard door opens. The problem is that the lights turn on when the ...
0
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2answers
4k views

Calculating current in a series circuit

Given the following circuit, it seems like we could use ohms law to conclude that current = voltage / resistance. With a source voltage of 3.3 and a resistance value of 220, current = 3.3 / 220 = .015 ...
1
vote
1answer
104 views

Understanding LED specifications (hobby kit)

I have an LED that looks like: It did not come with specs for the LED. In laymens terms, I'm trying to determine the technical term for the following descriptions. (What is the max amount of current ...
0
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3answers
734 views

Digital Rotary Encoder — Broken? Or am I misunderstanding how it works?

I apologize if this seems like a fundamental question, but I feel like I'm missing a fundamental understanding about digital rotary encoders, because none of my basic encoders are working as expected. ...
4
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5answers
6k views

What is a good alternative for the UA741 opamp in hobby projects?

Related to What's the uA741's appeal?, a lot of schematics use this rather dated opamp. My follow-up question would be: What is a good alternative? Of course if you have specific requirements ...
-2
votes
1answer
101 views

A good way to get into Electronics with just 2 hours per week? [closed]

I want to get into electronics but I only have 2 hours per week to spend time-wise and my budget is low. What are some good projects? Perhaps I should spend my time doing C programming challenges ...
1
vote
1answer
371 views

Tapping into a 4 AWG wire

I am part of a hobby project where we have a pair of fat, insulated #4 AWG stranded copper wires carrying +5V and ground. I want to tap into these wires every few inches to draw power off it (max draw ...
0
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2answers
455 views

Weak and Cheap Linear Actuator? [closed]

I have a tiny tube that sprays lubricant but I need it to move between some holes in a line. The total distance is only 10 inches. So imagine the holes like this: ...
0
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1answer
111 views

Control a knob on a Honeywell fan via ESP8266

Hey all I am wondering what all I would need in order to control this knob on my Honeywell 2-in 1 Air Circulator Fan, HT-9700 I am wanting to use a ESP8266 in order to control it via wifi. I know ...
1
vote
0answers
91 views

Low voltage LED bulb or jump into line voltage?

I'm not even sure if this is appropriate StackExchanage community for this but I wasn't sure where else this sort of question would fit. So I tinker with electronics here and there and primarily it ...
1
vote
1answer
49 views

Buying Low Volume Populated PCBs and Handling Passive PNs

New to Eagle PCB design. I plan on making a custom Beaglebone Black Wireless PCB, and so have pulled down the Eagle files. I'm a student and have a student license. This project will be too difficult ...
3
votes
1answer
2k views

Do I need to add smoothing capacitor for this setup

I'm trying to build an array (100) of WS2812B which are controlled over an Particle Photon, both are powered by a 10A/5V power supply. Powerwise: 10 WS2812B will be daisy-chained in one row Datawise:...
1
vote
2answers
220 views

How do you drill a homemade double sided pcb

I have a PCB that I am prototyping at home and it is double sided.... When I drill on one face the other face peels up a little. Does any one know how to avoid this problem?
6
votes
4answers
2k views

What is so special in the power MOSFETS IRFD120 and IRFD110?

I was trying out a hobby project and I was using the IRFD120 and IRFD110 power MOSFETs to control a motor. The transistors worked pretty fine and we simply ran out of them. When I went to buy some ...
2
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2answers
1k views

Is it safe to over-volt brushless out-runner dc motor on low load conditions?

I have a 1100KV brushless DC motor (turnigy d3548/4) rated maximum voltage 19V i want to run it at 25V assuming low load as i mostly need the higher rpm ! whats are the effects of this higher ...
0
votes
1answer
249 views

How to wire the mains to a transformer for end user safety?

Because this can be deadly, and is best left to someone qualified; advice for hobbyist projects on the web are reluctant to offer advice on safely handling mains connections. The get-around is to ...
1
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2answers
76 views

What is the term for a photo sensor that takes low-resolution, black-and white, closeup images?

For work I used to have to read and log 7-segment LCD numbers off this tiny (3cm x 1cm) screen tens of times per day. Now I have a webcam setup that reads it for me and does some OCR to automatically ...